Well-tubing.



PATENTED SEPT. 5, 1905.

0. A. LANTZ.

WELL TUBING.

APPLICATION FILED FEB.25,1905.

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WELL-TUBING.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed February 25,1905. Serial No. 247,376-

Be it known that 1, CHARLES A. LAX'IZ, a citizen of the United States, residing at \Velsh, in the parish of Ualcasieu and State of Louisiana, have invented new and useful Improvements in ell-Tubing, of which the followingis a specification.

The invention relates generally to improvements in well-tubing for use in drive-wells, bored wells, or other wells drilled or bored by whatever process, and particularly to a strainer or screen for the lower or point end of the tubing used in water-wells, oil-wells, gas-wells, or any other wells where screens are used or necessary.

The main object of the invention is the provision of a strainer particularly designed to permit free access of water, oil, or sand to the tubing and constructed to avoid the clogging usually incident to strainers of this character.

The invention is illustrated in the accompan ying drawings, wherein Figure I is a view in elevation, partly in section, of my improved strainer. Fig. 2 is an enlarged transverse section of the same. Fig. 3 is a broken elevation of the spacingstrip for use with the strainer-casing. Fig. 4: is a view in elevation of a modified form of wrapping for the strainer-casing. Fig. 5 is a similar view of another form of wrapping.

Referring to the drawings, 1 represents the strainer-casing, preferably perforated, as at 2, and designed to be connected as the lower section of the usual well-tubing. The lower end of the casing is provided with the usual threaded extension 3 to receive the ordinary drive-point.

4. represents what I term srmcing-strips, comprising, preferably, elongated sections having depending teeth or ribs 5. These strips are secured on the outer side of the strainercasing with their ribs 5 in contact with the peripheral surface of said casing. The strips are preferably arranged intermediate the longitudinal rows of perforations in the casing 1, the spaces between the ribs 5 and between the strips a serving to permit free access of the material into the casing. As a medium for securing the strips in place and at the same time providing openings through which the desired material may find its way into the casing I provide a wrapping 6, preferably of wire, designed to be wound about the casing in close contact with the outer surface of the strip, the adjacent coils of the wire Wrapping being in close contact. Practice has demonstrated, however, that provision for the entrance of the material other than the openings normally between coils of plain wire so wound must be made, and this I provide by using in the preferred form a flat wire 7, which is twisted upon itself, as shown, previous to being wound about the strip. This construction provides innumerable interstices or openings between the adjacent coils of the wound wrapping, through which the material may find its way into the casing. The flat wire so twisted is particularly adapted for those wells delivering water; but for oil or sand wells I have found that the eiliciency is materially increased by constructing the wrapping of a wire having a shape other than fiat. For instance, for the wrapping of a casing designed to serve as a screen in oilwells the wire in its initial shape should be square, as at 8, Fig. I, and twisted longitudinally upon itself to provide practically the form shown in Fig. 4.. This structure provides a larger number of openings between the adjacent coils of the wrapping and is particularly effective for oil-wells.

For use in sand-wells the wire composing the wrapping is preferably hexagonal prior to its twisting, as shown in Fig. 5, as at 9. This form is particularly serviceable in excluding quicksand in oil or water wells,wherc by to prevent the wells "from choking up.

In the use of the invention the openings between the adjacent coils of the wrapping provide an entrance for the water, oil, or sand into the well-casing, and this entrance or passage is further insured by the spacing of the strips 4 and the openings intermediate the ribs of each strip.

I am aware that it has been heretofore proposed to wrap the strainer of a well-tubing with wire; but the disadvantage of the plain wrap-wire is that the openings between the coils have in practice become clogged or stopped up, interfering materially with the circulation through the strainer. By my invention this clogging is entirely obviated, as will be evident, and a full free circulation through the strainer maintained in all conditions of the well.

I do not desire to limit myself to the particular scctional formation of the wrappingwires described, as other and varying forms may be readily used, it being understood that the gist of my invention resides in a perforated well-casing carrying on the outer side thereof a series of longitudinally-arrauged strips having projecting ribs in contact with the well-casing, which strips and casing are enveloped in a wrapping of wire of a sectional shape other than round and twisted to provide when in place a number of openings between the adjacent coils.

Having thus described the invention, What is claimed as new is 1. A well-tube strainer comprising a perforated casing, a series of spacing-strips on the outer side thereof, means for supporting said strips spaced from the surface of the easing, and a twisted-wire wrapping formed in close coils about said strips.

2. A Well-tube strainer comprising a perforated casing, a series of strips spaced on the outer side thereof, means for supporting said strips spaced from the surface of the casing, and a wire wrapping formed in close coils about said strips, said wire being of angular shalpe in cross-section and twisted longitudina y.

3. A well-tube strainer comprising a perforated casing, a series of strips longitudinally arranged and spaced apart on the outer surface of said casing, said strips having pro- CHARLES A. LANTZ. Witnesses:

A. E. BELL, C. E. CARR. 

